There have been a few news updates over the last couple of days. According to Serebii,net, the new game demo of X and Y reveals that Mega Evolutions seem to involve a button that appears in the battle menu. This probably means that Mega Evolutions don't activate automatically. Another detail that's been revealed is that Fariy-type attacks aren't very effective against Fire Pokemon. I'm not sure how that makes sense, but okay.
The biggest news in the past couple of days is the preview for a brand new Pokemon anime. It's going to be called Pokemon Origin, and is based heavily on the first generation games. And rather than Ash, the protagonist of the series is going to be Red, the very first player character of the games. There has been a trailer for the series which I'll try to post later this evening. So stay tuned.